Hey guys, new to the forum, and while I have been playing paintball more then once, I'm a total dunce when it come to maintaning or replacing parts on a marker. Every time I hook up CO2 to my MR2, I hear air hiss out the barrel. its not loud or coming out in large amounts, but its still leaking quite a bit. I tried replacing the cup seal and the stricker O- ring like the intructions say to do, and have even oiled up my marker, but the air still leaks from the barrel. Is there a way to fix this?
if nobody knows, is there anyplace where somebody can fix it for me?
any help would mean a lot.

I use a special compound (tho I still dont know the name) that is ment for the perpose of removing improfections on the valve. It's an oily sand you place on a round glass and do figure 8's with the valve. I would just take it to your local proshop, they will fix it up in short order.

To remove the valve, you take out the brass screw at the base of the gun. Once that is removed, take out the striker and the front cap. You should be able to push it out with something long. Just be sure not to damage it or scratch the inside of the lower tube. Pay attention to the way it comes out because that's the way you'll need to put it back. Also, be sure to use Dow on the valve o-rings and not "gun oil."